Improvement in hoisting apparatus



W. HAWKINS.

HOISTING APPARATUS.

Patented July 24,1877.

Inventor UNITED STATES PATENT OFFICE.

WILLIAM HAWKINS, OF SAN FRANCISCO, CALIFORNIA.

IMPROVEMENT IN HOISTING APPARATUS.

Specification forming part of Letters Patent No. 193,333, dated July 24, -1877 application filed June 18, 1877.

from end to end by the rotation of the shaft.

This nut is connected by suitable ropeswith drums or pulleys for multiplying the motion given by the screw, and to connect with the elevator-cage.

In the accompanying drawing the figure is a perspective view of my device.

A is an elevator-cage, moving in suitable guides B, and operated by the rope C, which passes over a pulley, D, at the top, extending thence down to the winding-pulley E, which is secured to. the same shaft with the drum F.

These parts are not essentially difi'erent from those employed upon many difi'erent styles of hoisting apparatus, and may be used equally well with my device, which consists of a screw, G, which, in the present case, is a horizontal shaft, with journals turning in boxes at each end. This shaft has a screw thread or threads cut upon it, and of a pitch sufficient to move a traveling nut, H, at the proper rate of speed. Thus nut has a guide or guides, I, placed in any suitable manner, either singly,

rotated and the cage elevated, and when the nut is moved inward the cage will belowered. The screw may be driven in any suitable manner; but I have shown a crank, K, at one end, and one or more engines may be con-v nected directly with this shaft, so as to rotate it at the desired speed or, if desired, a double belt-pulley may be used.

Any of the ordinary devices may be used for stopping the elevator or changing its motion but I have not considered it necessary to show these, nor any other than the present arrangement and connection of the screw with a hoisting apparatus.

Having thus described my invention, what I claim, and desire to secure by Letters Patent, is

The device herein described for operating elevators and hoisting apparatus, consisting of the rotating screw-shaft G, with its traveling nut H, in combination with the operatingropes and the speed -increasing drums and pulleys E F, or equivalent devices, substanstantially as herein described.

In witness whereof I have hereunto set my hand.

WILLIAM HAWKINS.

Witnesses:

Gno. H. STRONG, FRANK A. BROOKS. 

